The choreographed drill reflects the Japanese government’s efforts to prepare in case of a possible war against North Korea.

“A missile from North Korea would arrive in less than 10 minutes and the first alert would come about three minutes after launch, which gives us only around five minutes to find shelter,” Japanese government official Hiroyuku Suenaga told volunteers.

In November 2017, the Pentagon detected a North Korean missile launch that landed in the Sea of Japan. Soon after, Japanese and South Korean authorities convened an emergency meeting to talk about the impending threat of a nuclear war.

Despite hope that North Korea's participation in the next Winter Olympics in South Korea will ease tensions in the region, Japan's Foreign Ministry Norio Maruyama told Euronews that his government is "actively seeking partners to form an international alliance" against Pyongyang.

"The North Korean problem is becoming more and more worrying for us. The threat level is unprecedented and what's more their missiles can now reach Europe," said Maruyama.